Obama aide: 'Possible' Russia could enter Ukraine

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Soldiers with Russian and Crimean patches and pro-Russian militia members guard outside the Belbek airbase after Russian troops took control over it, outside Sevastopol, Crimea, on Saturday, March 22, 2014. Russian forces used at least four armored vehicles to break into an air base here, seizing control of one of the last Ukrainian military outposts in Crimea. After an hours-long tense standoff between Russian and Ukrainian forces, gunfire and explosions could be heard as the vehicles broke down the gate at the air base located just outside Sevastopol. (AP Photo/Andrew Lubimov)